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Advanced Encryption Standard (AES) is a symmetric block cipher adopted for securing digital data through fixed-size 128-bit blocks and key lengths of 128, 192, or 256 bits. Its design is for strong cryptographic security and efficient performance . Other Encryptions like Triple DES (3DES) are slower & less efficient, and ChaCha20 has better performance in resource-constrained environments. Also, Blowfish is fast but has vulnerabilities at higher key lengths. Each cipher balances security and speed differently. However, it depends on the specific use case and hardware limitations. Encryption Methodology AES (Advanced Encryption Standard) AES operates with a block size of 128 bits and supports key sizes of 128, 192, and 256 bits. Its encryption involves multiple rounds of substitution, permutation, and combining steps to transform plaintext into ciphertext. DES (Data Encryption Standard) DES is an old block cipher that uses symmetric encryption but has limitations due to its short key length and simple structure. DES uses a 64-bit block size and a 56-bit key and applies 16 rounds of permutations and substitutions to encrypt data. However, its small key size makes it vulnerable to brute-force attacks. 3DES (Triple DES) 3DES improves the aging DES encryption algorithm by applying it 3 times with different keys. Data is first encrypted, then decrypted, and encrypted again, using a set of three 56-bit keys. This ' encrypt-decrypt-encrypt ' process improves security over DES by making it difficult for cyber attackers to break the encryption. RSA (Rivest–Shamir–Adleman) RSA is an encryption algorithm that secures key exchange and digital signatures. Unlike AES, RSA uses a pair of keys: a public key for encryption and a private key for decryption. RSA uses a variable block size that depends on the key size, which is 2048 bits or larger. Its encryption and decryption processes are based on number theory for secure communication. ChaCha20 ChaCha20 is a stream cipher developed as an alternative to the older RC4 cipher. It uses a symmetric key and operates in a similar manner to AES-CTR but provides security and is designed for environments with limited hardware resources. ChaCha20 uses a 256-bit key and operates on 64-byte blocks (512 bits) and generates a keystream through a series of bitwise operations and modular arithmetic. Then, this keystream is XORed with the plaintext to produce ciphertext for secure and stream encryption. Performance and Speed AES AES provides high performance when hardware acceleration is available (e.g., AES-NI in modern CPUs). It is optimized in software and hardware implementations for large-scale encryption tasks. DES DES has a smaller key size (56 bits) and is slower than modern encryption standards. Its security is outdated and is no longer practical for securing sensitive data. DES is slow in software implementations due to its vulnerabilities. 3DES 3DES is slower than AES due to its triple encryption process. It faces similar vulnerabilities as DES but with a larger key size. This makes 3DES less suitable for modern use. It performs slower than AES and is replaced by AES in modern applications. RSA RSA is slower than symmetric algorithms, as it depends on large key sizes for security. It encrypts large amounts of data, but developers use RSA for key exchange, digital signatures, and small data encryption. ChaCha20 ChaCha20 is faster than AES in some environments on devices without hardware acceleration. It is well-suited for mobile and low-resource devices to provide strong encryption with minimal overhead. ChaCha20 delivers high performance on mobile and low-resource devices. Security and Resistance to Attacks AES AES has undergone cryptanalysis and is secure for modern use. The algorithm has been studied, and no feasible attack methods have been discovered for the key sizes currently in use (128, 192, and 256 bits). DES DES is vulnerable to brute-force attacks due to its small 56-bit key size. Modern computing power makes it no longer suitable for protecting sensitive data. DES has low security due to its weak 56-bit key size. Hence, it can be broken by modern brute-force and exhaustive search attacks. 3DES 3DES provides a stronger security level than DES by applying the encryption process three times. However, its 168-bit key size is still vulnerable to certain attacks, and it is inefficient compared to AES. RSA RSA is secure for key exchange and digital signatures but isn’t used for bulk data encryption. Its security relies on the difficulty of factoring large prime numbers. However, RSA encryption with smaller key sizes is no longer considered secure against modern attacks. ChaCha20 ChaCha20 resists cryptographic attacks and is considered secure. Developers use ChaCha20 in environments with limited hardware resources, where AES may be slower. ChaCha20 provides security, is resistant to known attacks, is secure for modern encryption needs, and has minimal vulnerabilities. Use Cases and Applications AES AES is an encryption standard for modern applications (including secure video streaming), file encryption, disk encryption, and secure communications. It is supported by major platforms, including hardware-accelerated encryption in CPUs. DES DES is an outdated symmetric-key algorithm and is no longer used for securing sensitive data due to its vulnerability to brute-force attacks. People use DES for securing legacy systems, but it is no longer recommended. 3DES 3DES was used as a transitional encryption standard after DES was deprecated. It is used in some legacy systems but is being phased out in favor of AES. People use it for legacy financial systems and banking encryption. RSA People use the RSA symmetric-key algorithm for key exchange, digital signatures, and SSL/TLS encryption. It’s not suitable for bulk data encryption but secures communications and provides authentication. ChaCha20 Developers use ChaCha20 in mobile and low-resource environments due to its speed and security. It is used in modern protocols like TLS 1.3 and can be an alternative to AES in certain use cases. Summary Table: AES vs Other Algorithms