Evm Opcode Analysis (Global)
High-quality technical overview of Evm Opcode Analysis in the context of blockchain security.
Algorithm Type: Block Cipher. Structure: Feistel Network. Key Length: 56 bits. Block Size: 64 bits. Status: Deprecated (replaced by AES). Variants: Single DES, 3DES (Triple DES). Vulnerabilities: Small key space, Differential cryptanalysis, Brute-force attacks.
graph LR
Center["Evm Opcode Analysis (Global)"]:::main
Rel_evm_analysis["evm-analysis"]:::related -.-> Center
click Rel_evm_analysis "/terms/evm-analysis"
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🧒 Explique-moi comme si j'avais 5 ans
DES is like a very old, famous lock that everybody used in the 1980s. At the time, it was impossible to pick. But as thieves got better tools (faster computers), they figured out how to pick the lock very quickly. Today, nobody uses the original DES to protect important things because it's too easy to break. We use a much stronger, newer 'lock' called AES instead.
🤓 Expert Deep Dive
Technically, DES is a 'Feistel Cipher' that performs 16 rounds of substitution and permutation. A common misconception is that the key is 64 bits; however, 8 bits are used for parity, leaving only 56 bits of effective entropy. In 1999, the 'DES Challenge III' proved that the key could be broken in less than 24 hours. To temporarily fix this without redesigning the algorithm, 'Triple DES' (3DES) was introduced, which performs the DES operation three times (encrypt-decrypt-encrypt) using two or three different keys. This increases the effective key length to 112 or 168 bits. However, because 3DES is based on older 64-bit blocks, it is vulnerable to 'Sweet32' attacks and is significantly slower than the modern 'AES' (Rijndael), which uses larger blocks and more efficient mathematical operations. NIST officially withdrew the DES standard in 2005.