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SHA-0 (Secure Hash Algorithm 0) is the original version of the SHA-1 hash function, published by the NSA in 1993. It was withdrawn shortly after publication due to an undisclosed "significant flaw" and replaced by SHA-1. SHA-0 produces a 160-bit (20-byte) hash value, typically expressed as a 40-character hexadecimal number.
⚠️ Security Warning: SHA-0 is considered cryptographically broken and was withdrawn by NSA due to undisclosed flaws. It is highly vulnerable to collision attacks and should never be used for security purposes. Consider using modern algorithms like SHA-256 or SHA-3 instead.
SHA-0 represents an important milestone in cryptographic history as the first Secure Hash Algorithm standard:
| Year | Event |
|---|---|
| 1993 | SHA-0 published as a Federal Information Processing Standard (FIPS) |
| 1995 | SHA-0 withdrawn by NSA, replaced by SHA-1 with minor modifications |
| 1998 | First theoretical attacks published |
| 2004 | Practical collision attack demonstrated |
| Algorithm | Output Size | Security Status | Common Uses |
|---|---|---|---|
| SHA-0 | 160 bits | Broken | Historical, research only |
| SHA-1 | 160 bits | Broken | Git, legacy certificates |
| SHA-256 | 256 bits | Secure | Cryptography, blockchain, certificates |
| SHA-3 | Variable | Secure | Modern applications, post-quantum |
💡 SHA-0 is primarily of historical and academic interest today. For any practical applications, use modern secure hash algorithms like SHA-256 or SHA-3.
